feat(cron): start of working loop

src/cron/daemon/build.v

@@ -1,9 +1,25 @@
 module daemon
 
-import git
 import time
 import sync.stdatomic
 
+const build_empty = 0
+const build_running = 1
+const build_done = 2
+
+// reschedule_builds looks for any builds with status code 2 & re-adds them to
+// the queue.
+fn (mut d Daemon) reschedule_builds() ? {
+	for i in 0..d.atomics.len {
+		if stdatomic.load_u64(&d.atomics[i]) == build_done {
+			stdatomic.store_u64(&d.atomics[i], build_empty)
+			sb := d.builds[i]
+
+			d.schedule_build(sb.repo_id, sb.repo) ?
+		}
+	}
+}
+
 // update_builds starts as many builds as possible.
 fn (mut d Daemon) update_builds() ? {
 	now := time.now()
@@ -13,7 +29,7 @@ fn (mut d Daemon) update_builds() ? {
 			sb := d.queue.pop() ?
 
 			// If this build couldn't be scheduled, no more will be possible.
-			if !d.start_build(sb.repo_id)? {
+			if !d.start_build(sb)? {
 				break
 			}
 		} else {
@@ -22,13 +38,14 @@ fn (mut d Daemon) update_builds() ? {
 	}
 }
 
-// start_build starts a build for the given repo_id.
-fn (mut d Daemon) start_build(repo_id string) ?bool {
+// start_build starts a build for the given ScheduledBuild object.
+fn (mut d Daemon) start_build(sb ScheduledBuild) ?bool {
 	for i in 0..d.atomics.len {
-		if stdatomic.load_u64(&d.atomics[i]) == 0 {
-			stdatomic.store_u64(&d.atomics[i], 1)
+		if stdatomic.load_u64(&d.atomics[i]) == build_empty {
+			stdatomic.store_u64(&d.atomics[i], build_running)
+			d.builds[i] = sb
 
-			go d.run_build(i, d.repos_map[repo_id])
+			go d.run_build(i, sb)
 
 			return true
 		}
@@ -37,9 +54,10 @@ fn (mut d Daemon) start_build(repo_id string) ?bool {
 	return false
 }
 
-fn (mut d Daemon) run_build(build_index int, repo git.GitRepo) ? {
+// run_build actually starts the build process for a given repo.
+fn (mut d Daemon) run_build(build_index int, sb ScheduledBuild) ? {
 	time.sleep(10 * time.second)
 
-	stdatomic.store_u64(&d.atomics[build_index], 2)
+	stdatomic.store_u64(&d.atomics[build_index], build_done)
 }
 

src/cron/daemon/daemon.v

@@ -30,7 +30,7 @@ mut:
 	api_update_timestamp time.Time
 	queue                MinHeap<ScheduledBuild>
 	// Which builds are currently running
-	builds []git.GitRepo
+	builds []ScheduledBuild
 	// Atomic variables used to detect when a build has finished; length is the
 	// same as builds
 	atomics []u64
@@ -47,7 +47,7 @@ pub fn init_daemon(logger log.Log, address string, api_key string, base_image st
 		global_schedule: global_schedule
 		api_update_frequency: api_update_frequency
 		atomics: []u64{len: max_concurrent_builds}
-		builds: []git.GitRepo{len: max_concurrent_builds}
+		builds: []ScheduledBuild{len: max_concurrent_builds}
 		logger: logger
 	}
 
@@ -62,14 +62,37 @@ pub fn init_daemon(logger log.Log, address string, api_key string, base_image st
 // periodically refreshes the list of repositories to ensure we stay in sync.
 pub fn (mut d Daemon) run() ? {
 	for {
+		println('1')
+		// Cleans up finished builds, opening up spots for new builds
+		d.reschedule_builds() ?
+		println('2')
+		// Schedules new builds when possible
 		d.update_builds() ?
+
 		println(d.queue)
 		println(d.atomics)
 
-		time.sleep(60 * time.second)
+		time.sleep(10 * time.second)
 	}
 }
 
+// schedule_build adds the next occurence of the given repo build to the queue.
+fn (mut d Daemon) schedule_build(repo_id string, repo git.GitRepo) ? {
+	ce := parse_expression(repo.schedule) or {
+		d.lerror("Error while parsing cron expression '$repo.schedule' ($repo_id): $err.msg()")
+
+		d.global_schedule
+	}
+	// A repo that can't be scheduled will just be skipped for now
+	timestamp := ce.next_from_now() ?
+
+	d.queue.insert(ScheduledBuild{
+		repo_id: repo_id
+		repo: repo
+		timestamp: timestamp
+	})
+}
+
 fn (mut d Daemon) renew_repos() ? {
 	mut new_repos := git.get_repos(d.address, d.api_key) ?
 
@@ -101,19 +124,11 @@ fn (mut d Daemon) renew_queue() ? {
 		}
 	}
 
+	d.queue = new_queue
+
 	// For each repository in repos_map, parse their cron expression (or use
 	// the default one if not present) & add them to the queue
 	for id, repo in d.repos_map {
-		ce := parse_expression(repo.schedule) or { d.global_schedule }
-		// A repo that can't be scheduled will just be skipped for now
-		timestamp := ce.next(now) or { continue }
-
-		new_queue.insert(ScheduledBuild{
-			repo_id: id
-			repo: repo
-			timestamp: timestamp
-		})
+		d.schedule_build(id, repo) ?
 	}
-
-	d.queue = new_queue
 }

src/cron/expression/expression.v

@@ -114,7 +114,7 @@ pub fn (ce &CronExpression) next(ref time.Time) ?time.Time {
 	})
 }
 
-fn (ce &CronExpression) next_from_now() ?time.Time {
+pub fn (ce &CronExpression) next_from_now() ?time.Time {
 	return ce.next(time.now())
 }